src/test/java/com/android/tools/r8/shaking/ifrule/AllowHorizontalClassMergingWithIfRuleTest.java

// Copyright (c) 2023, the R8 project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
package com.android.tools.r8.shaking.ifrule;

import com.android.tools.r8.TestBase;
import com.android.tools.r8.TestParameters;
import com.android.tools.r8.TestParametersCollection;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.Parameterized;
import org.junit.runners.Parameterized.Parameter;
import org.junit.runners.Parameterized.Parameters;

@RunWith(Parameterized.class)
public class AllowHorizontalClassMergingWithIfRuleTest extends TestBase {

  @Parameter(0)
  public TestParameters parameters;

  @Parameters(name = "{0}")
  public static TestParametersCollection data() {
    return getTestParameters().withAllRuntimesAndApiLevels().build();
  }

  @Test
  public void test() throws Exception {
    testForR8(parameters.getBackend())
        .addInnerClasses(getClass())
        .addKeepMainRule(Main.class)
        .addKeepRules("-if class * { void foo(); } -keep class " + Main.class.getTypeName())
        .addHorizontallyMergedClassesInspector(
            inspector ->
                inspector
                    .assertIsCompleteMergeGroup(A.class, B.class, C.class)
                    .assertNoOtherClassesMerged())
        .setMinApi(parameters)
        .compile()
        .run(parameters.getRuntime(), Main.class)
        .assertSuccessWithOutputLines("Hello, world!");
  }

  static class Main {

    public static void main(String[] args) {
      Object aOrBOrC =
          System.currentTimeMillis() > 0
              ? new A()
              : System.currentTimeMillis() > 1 ? new B() : new C();
      System.out.print(aOrBOrC);
      A.foo();
    }
  }

  static class A {

    static void foo() {
      System.out.println();
    }

    @Override
    public String toString() {
      return "Hello, world!";
    }
  }

  static class B {}

  static class C {}
}